Support fetching CMake dependencies via -Dprotobuf_FETCH_DEPENDENCIES=ON
#18806
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Support fetching CMake dependencies via
-Dprotobuf_FETCH_DEPENDENCIES=ON
This ports upb's WORKSPACE scraping logic to protobuf, and allows us to dynamically fetch our dependencies at the exact same pinned version as in Bazel via protobuf_FETCH_DEPENDENCIES=ON. This is mostly for development purposes, and is preferable to git submodules. In a later cl we will flip the default behavior to "package"
#test-continuous